Book 2 : after announce their relationship to public, Akira moved to live together with Kento
Book 1 : main story pairing Iori x Tomoya
Book 2 : continuing Innai Kansen. Story after the accident which caused Tomoya loss his memories
Book 1 : pairing Kyouichi x Imagase
Kyouichi was married man, but since he had affairs with some other woman he got blackmailed by Imagase a private investigator who's also his classmate when he was in college.
Book 2 : continuing Kyuuso Ha Cheese no Yume Omiru.
After divorce Kyouichi dating Imagase and live together. But Imagase's insecure feelings made them broke up. A half year later when Kyoichi decided to mary a nice girl Tamaki, Imagase appeared in front of him and ask him to leave her and comeback to him.
Book 1: main story pairing Yoshinaga x Takao
Book 2 : spinoff to Ubawareru Koto Marugoto Zenbu
Second story pairing Takehisa x Yuuichi. and an extra story.
Book 3 : spinoff to Suki Toiunoni Nazekashira. Pairing Kiyohito x Hisashi as main story
Book 1 : pairing Shin x Izumi
Memory of the Future